You can apply the change if you login again or import
to apply this change, login again or evaluate $HOME/.bashrc with source command.

$ source ~/.bashrc

You can check if the toolchain installed above works properly while checking the version of toolchain. If you can find gcc version 4.9.2 20140904 (prerelease) at the end of the line, the toolchain is well installed.

Checkout & compile

Before you compile U-boot, you must configure for ODROID-C2 with following command.

$ cd u-boot
$ make odroidc2_config

And finally you can compile U-boot.

$ make

Installation

The bootloader for ODROID-C2 is consisted with two part, 1st stage bootloader + U-boot. You can find u-boot.bin once you compile U-boot, as well as bl1.bin.hardkernel in the directory sd_fuse/. Both binaries must be installed in a card (eMMC or MicroSD).